/Engine/Source/Runtime/RHICore/Public/RHIPoolAllocator.h
bool HandleDefragRequest ( [FRHIPoolAllocationData](API\Runtime\RHICore\FRHIPoolAllocationData) * InSourceBlock, [FRHIPoolAllocationData](API\Runtime\RHICore\FRHIPoolAllocationData) & InTmpTargetBlock )